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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdcad791bcaff00105fb89022618d89e764cd02dd53f38f92d0d265ed956bbb' 
  AND token = 'S64O6OXRuC3qWMf0y4HTXfLLu9l9sNCTWc9S3GvZp34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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