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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9809be79278391d87e2ca7f32ab0ef0cf98aacf130ec8d94a0aefbc9e516a9f2' 
  AND token = 'kRfu3PkPE9f6rfUo8Ce3eH3DP+mX56wR9rIM2Evhmm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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