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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0be6bcc9ba14e5bb7cb2f0ccc68b5bbb53c8c064ec59f951513d47605664a1' 
  AND token = 'G2q0u4VjltYG8gAYKr9OM38TZsf6ULdC7gfL7W0u79c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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