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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2ba3ba0c2bc9d438c83534dc12d94c0e4fd3dbc1974ec056bbcbd3382289fd' 
  AND token = 'Cmh0x5oA1S06W9EW+K+mIsrlI0EQNw6IdlyjWR3vCJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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