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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0fecd16ebdf0c8f27ae821f29d1cd89c556cffc0f79f90b2f10ae8c6a8de77d' 
  AND token = 'rjCt8I2Y2Wb3PNAPvc5JpkxKoqfjwCvhE7+kqkhadtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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