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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc77a42c27d884fbf62c0566bf14b463c7d4d8f4cf0d0f4ad127702d9c7c3400' 
  AND token = 'Ds493U9IhEI//59699TkT7uq+pUgF6Bu41DPt6mHILI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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