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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31633b2e7ee17cda0b5f15e06307da0c23c3ccf353691d0781c32cbbe066aa78' 
  AND token = 'Vt6sMMJRpB4r8lcTc4MlAKyHp8OPncaOCjkvcflBV8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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