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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5144bdb9cab2bd8c7cc7d077d42a3d2cb64c5a78e56839d928bcb6e701f30ce' 
  AND token = 'htoSCf3VwhCZoeo9FD267B+Ohz4q21Dc90Hc1AoGukk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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