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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5c26a345af2acd7fb8507ecfb6b410d370cccf2d6e11265a6f1faa86729e60' 
  AND token = 'XDlBBjf23bw9iE88YdqbKC3J424UPvIJA+4fY59ZJw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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