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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2291b2f3fb7e1f65cae240d3ca2f505c5897a3c832d55cacef21cb69387f0c3' 
  AND token = 'DQQXKPsiGT9xG/hycZrmNWWSUObyUhfQ6tSk3T+g32w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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