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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b95188e262fb57cf65d3fb5ab2bd2fb0e92cefdcb9fec4e109e0cf96eed6c51' 
  AND token = '+e9Dqt7OJFeKNTpINBIXiSQlddYe5AEaAoZFWITM3Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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