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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5958d4cf4175c73bf5729f4a7f0d2c8916f1a5c9378c501b3d74d4ed31a65c0f' 
  AND token = '+Hbk1rzZ5TyjpkztGjyA1DRBsMpZpR8Vy5yubV+r650=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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