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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9303f2f79d000ab06e1449917375b0561dc39288943e7f025f408bd6238f113' 
  AND token = 'zAq2rMsGdraBbfu+bs/IxoScuGQRhYrA5KTTtNFRFm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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