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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f058b3a9ee082f68db44d01d434fd117a5d125a7a02fd124467c47a7801d88' 
  AND token = '+VhBnuNVQQ6vsfaInP0SUbikvbn+U65YqblRv04+g4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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