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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d8582a9ed332d64ec447b33f46837517b5011fd65497d0ad42a2f2200e7735' 
  AND token = 'RcTPNk2qDOdevSEE8CLqHuYZwXtr5ioPUlBNNxZ6mog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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