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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcbb79ccf7204b0c2239b5b620a3a50632929795151bb204833ad65674f80b4' 
  AND token = 'd3aF8JMn/JbhK7wxq/ymCd0vEZmbYzcZ1PH0f8e9ooY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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