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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94269a33a2b075ac3e8d324e8ff8008abf56096f311ef102e4e5923776aa56d1' 
  AND token = 'mjb0AAXuicPX2NguKYPx8ERD2c0IsWEdds4qbVkXRYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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