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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbda0887852b88ae45f929235fb57a3e046105100776eb0061a608fdd71369d' 
  AND token = 'lSfKCPmUZq2wECtbS3YztiClW0fGjSK4OAer3t3gSeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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