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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc950381049fa81ab69b4d010d6693b563b6d4707e13603996919c784f8cbe21' 
  AND token = 'AYkqprKa57yNYnZIQldlc0S3qt7dUR1pALZH+2ywoAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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