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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2307ce20e8ecc22ef57e8c67e7e8df926136f5d9e7a1e28b4ddd1a735b91bc' 
  AND token = 'TVjCror17WZa/VuYFRl9l38Hsb9NdOD80BssuUWc48I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}