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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f725f0c9946a1fa33e0562c57474efa768e1ca86ed37870c23f1e1c567fc77' 
  AND token = '56PGe4t5/Ih1Vyr0Uk+j34xhJtlhl2eo4kHO/Vq7Xm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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