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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16bdea465fdc5ced35f9e3d7ab4b57e5a13e6567028a602a1809997e350f37b7' 
  AND token = 'BrgHDTZwJD2WI98hTZXtPiSi8eH4MhRMH3+klzITxtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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