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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab127fb91d69d4ad5c5a8bbfc7d0dd23ffad45a8d8ca8bb0a39580036c332fd' 
  AND token = '4vvbUDa+i0AwsxBgz0/fELyFBM1DkuRHaLq6gZihkao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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