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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd275d9b937c79f0f60bd73aa4e567c19f5c4eec740756780584e73317c901d1d' 
  AND token = 'EWPcJqf0xSHNpQl2EWP1B/Kr7fZ7sbEDRG9kpb33i8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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