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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d3e544dc950671ecf1a3c162395a072a49add0b6146eee01ea480ddc862159' 
  AND token = 'RP7tUOdtpJ/6ZiBZVgZ1z1I7eqNVpQaxvXi3EHE939g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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