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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea5da027817d71ec67e2e4cf2f18aff611d5797da615b1bfdd478a1d00fea98' 
  AND token = 'CSQVXOCvoGXQSr5PwPEocJashPpN3UDlTgi4l9jKga0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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