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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765341106eeb3cc22d6c8f1432a66aae4012614ee3cfe55c27c6fb755d9932fc' 
  AND token = 'FR4zGt3mXkgEwolaBorU3MPZR2aWNSidmzB2mmckTkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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