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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a706b6af2884f71b0bebd677d5e2c8965beed283aca14be846c0b7d203692032' 
  AND token = 'hvrQf6bQwYkiALTsqNjV/M7UwC2jtid+fJH90qmb6R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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