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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bee0364f2df206094e7a9ff38a9322d2aa1b8d692cc87475c7b5739d0f9a68c' 
  AND token = 'G4izEwGowoZjQnIQdSMv0SKEBab13RPlovY9Mr6oQjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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