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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788641033d2093419a9e907836c23fe50dd77690b8a47f9df3fc652eaae350fe' 
  AND token = 'ZLdvE5NPT2luC+qDSy5WhRgEGnmworTmd2GHikgZX2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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