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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a86849d339b40528500dac03be06630e992b1703a2412ada2d47a6150efee4e' 
  AND token = '9bg4y1MY5zXno3MVmIPr7NSGeP8oJyZsN/3dvJf3bdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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