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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4c317ee896ab297dd97bc6f47eec10a2ae6ebb5f4d24090faf6b541fee02d4' 
  AND token = 'f5mi/2wH4w6ktRU4zlagOB0/N4e4Ql2XnUheYbSGYDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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