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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3f9c9cc75560c57cffdc9e5440a59073f662c00ac1edd8a0dfbfebaf0b5eb6' 
  AND token = 'RWf0Tj36uGDMSGDqjsg2/bHWhIwyjNwsn2aO4Qnn1rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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